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IPIP-379 Delegated Naming HTTP API
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Propose HTTP APIs for delegated naming system that enables offloading of
naming system to other processes or servers.

Relates to:

- #377

Fixes #343
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masih authored and hacdias committed May 25, 2023
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4 changes: 2 additions & 2 deletions src/ipips/ipip-0337.md
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Expand Up @@ -70,7 +70,7 @@ To understand the design rationale, it is important to consider the concrete Ref
So this API proposal makes the following changes:

- The Delegated Content Routing API is defined using HTTP semantics, and can be implemented without introducing Reframe concepts nor IPLD
- There is a clear distinction between the RPC protocol (HTTP) and the API (Deleged Content Routing)
- There is a clear distinction between the RPC protocol (HTTP) and the API (Delegated Content Routing)
- "Method names" and cache-relevant parameters are pushed into the URL path
- Streaming support is removed, and default response size limits are added.
- We will add streaming support in a subsequent IPIP, but we are trying to minimize the scope of this IPIP to what is immediately useful
Expand All @@ -80,7 +80,7 @@ So this API proposal makes the following changes:
- Multiaddrs use the [human-readable format](https://github.com/multiformats/multiaddr#specification) that is used in existing tools and Kubo CLI commands such as `ipfs id` or `ipfs swarm peers`
- Byte array values, such as signatures, are multibase-encoded strings (with an `m` prefix indicating Base64)
- The "Identify" method and "message groups" are not included
- The "GetIPNS" and "PutIPNS" methods are not included
- The "GetIPNS" and "PutIPNS" methods are not included. Instead, a separate Delegated IPNS HTTP API aims to firstly facilitate naming system delegation, and secondly, pave the way for future iterations of IPNS with less interdependency with content routing. For more information, see Delegated IPNS HTTP API (:cite[ipip-0379]).

### User benefit

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95 changes: 95 additions & 0 deletions src/ipips/ipip-0379.md
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---
title: "IPIP-379: Delegated IPNS HTTP API"
date: 2023-02-13
ipip: proposal
editors:
- name: Masih H. Derkani
github: masih
- name: Marcin Rataj
github: lidel
url: https://lidel.org/
relatedIssues:
- https://github.com/ipfs/specs/issues/343
- https://github.com/ipfs/specs/pull/337
- https://github.com/ipfs/specs/pull/377
order: 379
tags: ['ipips']
---

- Start Date: 2023-02-13
- Related Issues:

## Summary

This IPIP specifies a set of HTTP APIs to offload naming system onto another process or server.

## Motivation

Expanding on the motivations of :cite[ipip-0337], the work here concentrates on delegation of _naming system_ over HTTP APIs. Naming is part of the core IPFS DHT functionality.
The performance of naming system over the IPFS DHT can suffer from long delays due to churn of records and quorum requirements.

## HTTP API Specification

See :cite[http-ipns-routing] specification.

## Design rationale

The rationale for delegated IPNS over HTTP APIs closely follows the reasoning listed in :cite[ipip-0337].

The document proposes the following:
- Use of HTTP semantics for publication and resolution of naming records.
- Preference for human-readable request and response encoding, such as JSON format
- Optional backward compatibility support for the existing ProtocolBuffer format using `Content-Type: application/vnd.ipfs.ipns-record`
- Use of extra headers in `OPTIONS` response to communicate the supported capabilities and limitations, namely:
- `X-Ipns-Allow-Max-Size` -- to signal maximum supported IPNS record size
- `X-Ipns-Allow-Protobuf` -- to signal whether the server supports ProtocolBuffer formatted records.
- Streaming interaction is not supported.

### User benefit

The ability of offload naming onto another process or server via an idiomatic and simple HTTP API opens up an opportunity to not only reduce the burden of naming system management, but also introduce alternative naming systems across other routing systems, namely IPNI.

### Compatibility

#### Backwards Compatibility

##### Serialization Format

:cite[ipns-record] use ProtocolBuffer serialisation format.
This format is widely in use in IPNS over PubSub and DHT routing systems.
One of the motivations of this document is to introduce simple to use HTTP APIs and ultimately reduce barrier for interaction across alternative systems.
Further, interoperability across the existing and HTTP APIs is also desirable in order to reduce the barrier for adoption of the delegated HTTP APIs.

The specification here maintains backwards compatibility in terms of record serialisation, with preference for human-readable formats such as JSON.
To maximize interoperability with existing ecosystem, the canonical IPNS record serialization format :cite[ipns-record] (`0x0300`) can be requested with content type `application/vnd.ipfs.ipns-record`.

##### Reframe

See "Backwards Compatibility" section of :cite[ipip-0337].

#### Forwards Compatibility

See "Forwards Compatibility" section of :cite[ipip-0337].

### Security

All interaction over the APIs should use TLS to protect against third-party observation and tampering.
Additionally, the IPNS records are signed by the publisher's identity and contain sequence number to avoid replay attacks.

To avoid Denial of Service attack, maximum IPNS record size of `10 KiB` applies.
Implements are permitted to set a lower limit. If lower than the default maximum, the limit should be discoverable via `OPTIONS` request with header key `X-Ipns-Allow-Max-Size` with value specified as the number of bytes.

Similarly, a client may check if a server supports ProtocolBuffer formatted records by checking the `X-Ipns-Allow-Protobuf` header key in response to `OPTIONS` request. If present the header value must be either `true` or `false` the absence of the header indicates that ProtocolBuffer formatted records are not supported.

Privacy in delegated IPNS is out of scope for this work.
- The usual JSON parsing rules apply. To prevent potential Denial of Service (DoS) attack, clients should ignore responses larger than 100 providers and introduce a byte size limit that is applicable to their use case.

### Alternatives

See:
- [Libp2p-based IPNS](https://github.com/ipfs/go-ipns).
- Reframe; find out more on "Design Rationale" section of :cite[ipip-0337].

### Copyright

Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
177 changes: 177 additions & 0 deletions src/routing/http-ipns-routing.md
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---
title: Delegated IPNS HTTP API
description: >
Delegated IPNS is a mechanism for IPFS implementations to offload naming system to another process
or server. This includes naming resolution as well as publication of new naming records. This
document describes an HTTP API through which such functionality is facilitated.
date: 2023-03-22
maturity: wip
editors:
- name: Masih H. Derkani
github: masih
order: 0
tags: ['routing']
---

Delegated IPNS is a mechanism for IPFS implementations to offload naming system to another process
or server. This includes naming resolution as well as publication of new naming records. This
document describes an HTTP API through which such functionality is facilitated.

## API Specification

The Delegated IPNS HTTP API uses the `application/json` content type by default.

As such, human-readable encodings of types are preferred. This spec may be updated in the future
with a compact `application/cbor` encoding, in which case compact encodings of the various types
would be used.

## Common Data Types

### IPNS Record

The following snippet outlines the JSON schema of IPNS records:

```json
{
"Signature": "<signature>",
"Payload": {
"Value": "<value>",
"Sequence": 0,
"Validity": {
"EOL": {
"Timestamp": 0,
"AdvisoryTTL": 0
}
},
"PublicKey": "<optional-public-key>",
"ExtendedData": {}
}
}
```

Where:

- `Signature` is the multibase-encoded signature of the sha256 hash of the `Payload` field, signed
using the private key that corresponds to the `PublicKey` in the `Payload` if present. And
Otherwise, the private key associcated to the IPNS record key. Signing details for specific key
types should
follow [libp2p/peerid specs](https://github.com/libp2p/specs/blob/master/peer-ids/peer-ids.md#key-types),
unless stated otherwise.
- `Payload` is the content of the IPNS record as specified
by :cite[ipns-record] specification:
- `Value` is the string representation of the IPNS path,
e.g. `ipns/{ipns-key}`, `/ipns/example.com`, `/ipfs/baf...`, etc.
- `Sequence` represents the current version of the record starting from `0`.
- `Validity` captures the mechanism by which the record is validated. Each validity type reserves a
field key under this object.
- `EOL` donates that the validity type is EOL, containing:
- `Timestamp` represents the time in the future at which the record expires with nanoseconds
precision represented as an ASCII string that follows notation
from :cite[rfc3339].
- `AdvisoryTTL` represents an optional field that hints at how long the record should be
cached.
- `PublicKey` represents the optional public key used to sign the record. This field is only
required if it cannot be extracted from the IPNS name, e.g. in the case of legacy RSA keys.
- `ExtendedData` represents the extensible data as arbitrary JSON object.

## Versioning

The path predix `/v1` donates the version number of the HTTP API. Backwards-incompatible change must
increment the version number.

## API

### `GET /naming/v1/records/{ipns-name}`

**Path Parameters**

- `ipns-name` the IPNS name to resolve.

**Response Status Codes**

- `200` (OK): indicates that the response body containing the IPNS record that corresponds to the
IPNS name.
- `404` (Not Found): indicates that no matching records are found.
- `400` (Bad Request): indicates that the given IPNS name is not valid.
- `429` (Too Many Requests): indicates that the caller is issuing requests too many request and may
retry after the time specified
at [Retry-After](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After) response
header has elapsed.
- `501` (Not Implemented): indicates that the server does not support resolution of IPNS records

**Response Body**

The response body contains the [IPNS record](#ipns-record).

```json
{
"Signature": "<signature>",
"Payload": {
"Value": "<value>",
"Sequence": 0,
"Validity": {
"EOL": {
"Timestamp": 0,
"AdvisoryTTL": 0
}
},
"PublicKey": "<optional-public-key>",
"ExtendedData": {}
}
}
```

### `PUT /naming/v1/records/{ipns-name}`

**Path Parameters**

- `ipns-name` the IPNS name to publish. The name must match `Value` in request body.

**Request Body**

```json
{
"Signature": "<signature>",
"Payload": {
"Value": "<value>",
"Sequence": 0,
"Validity": {
"EOL": {
"Timestamp": 0,
"AdvisoryTTL": 0
}
},
"PublicKey": "<optional-public-key>",
"ExtendedData": {}
}
}
```

**Response Status Codes**

- `200` (OK): indicates that the response body containing the IPNS record that corresponds to the
IPNS name.
- `404` (Not Found): indicates that no matching records are found.
- `400` (Bad Request): indicates that the given IPNS record is not valid.
- `429` (Too Many Requests): indicates that the caller is issuing requests too many request and may
retry after the time specified
at [Retry-After](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After) response
header has elapsed.
- `501` (Not Implemented): indicates that the server does not support publication of IPNS records

## CORS and Web Browsers

Browser interoperability requires implementations to support
[CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS).

JavaScript client running on a third-party Origin must be able to send HTTP request to the endpoints
defined in this specification, and read the received values. This means HTTP server implementing
this API must:

1. support [CORS preflight requests](https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request) sent as HTTP OPTIONS, and
2. always respond with headers that remove CORS limits, allowing every site to query the API for results:

```plaintext
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, PUT, OPTIONS
```

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